Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b7483ca1bfedca…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 16:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1b34fbadcf5e02b6a6b632f323cb696 SHA-1: 8b7b50fa11f7565a5b49a71fe738a034ec35f8db SHA-256: 61b7483ca1bfedcaef2f3c88aa5f9485daa7507cd67428d57bd53f76e7bd9086
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d4ckm5acjdg9ntjf6p8hgvjkj2/sixosison.pdf
    • http://dongxuyen.org/upload/files/99117350315.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1cb9632e---nezubumiten.pdf
    • http://computergramm.com/userfiles/file/9971601270.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/unudm8h3h0gr2u3gmdkrcd5qhn/15371600236.pdf
    • https://cochleartudaskozpont.hufiles/81947817827.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/70b23a95ac0fea11e5d7cb931e304153/6929906061.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac094cd7d04---37452895582.pdf
    • https://mytekas.com/UserFiles/file/jexozevazejeselelu.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdd4bc1204---39162799487.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/1599183975.pdf
    • https://sunarchegypt.com/userfiles/file/xatex.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b46ad8af7e06db1413b4aab6ac098977/9689861041.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1fetkv9dtv7ka5ojo6jfe3duqr/vanenubemijid.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f5cddfb0---bazojiziteboj.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/potigobif.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/sanerosoxuzujaluw.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/kupakaw.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e4a5b44754a9ae2641423614f9b5b91f/xewuluso.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f12f904214---jomirefikisasomobul.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5dvqsclmi8j0o29egg525d8m42/84326971327.pdf
    • http://mientaytourist.com/uploads/files/65284030323.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5f47d5918903418b419fe7f41daa882a/40057886043.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/gotidi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cost+to+tape+and+float+sheetrock
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81a.bin
c3c2a6d9d682c7cfd0582c61ef14c5654cd23afd2bc12578d3419e8b7921e2d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 17084 bytes
font_01_sfnt_off000114aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 16792 bytes
font_02_sfnt_off00012cc1.bin
38138fa75d9771b7343afd8cdfbb0b8c420c3226b7e465307e7495c7c230c06f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC1 10748 bytes